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Zhan Z.,CAS Fujian Institute of Research on the Structure of Matter | Wang Y.,CAS Fujian Institute of Research on the Structure of Matter | Lin Z.,State Key Laboratory of Structural Chemistry | Zhang J.,CAS Fujian Institute of Research on the Structure of Matter | Huang F.,CAS Fujian Institute of Research on the Structure of Matter
Chemical Communications | Year: 2011

Based on a novel Al-doped ZnO thin film/ZnO single crystal system, the effects of interface electric field on photocatalysis were investigated in detail. Both the position and intensity of the electric field are found to have decisive influence on the photocatalytic activities. © 2011 The Royal Society of Chemistry. Source


Lou B.,Minjiang University | Lou B.,State Key Laboratory of Structural Chemistry | He F.,Minjiang University
New Journal of Chemistry | Year: 2013

The biocompatible organic acids such as acetic acid (Hac), benzoic acid (Hbz) and nicotinic acid (Hnit), have been employed as second ligands to assemble biocompatible coordination polymers of theophylline (Hthp), respectively. As a result, three coordination polymers [Zn2(thp) 2(ac)(OH)]n (1), [Zn2(thp)2(bz)(OH)] n (2) and [Zn(thp)(nit)]∞ (3) have been synthesized through hydrothermal and mechanochemical reactions. Theophylline could be released rapidly in simulated gastroenteric fluid (phosphate-buffered solution, PBS) and slow release of theophylline could be achieved from the three polymers in pure water at 37 °C with continuous stirring. © 2012 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique. Source


Zhai H.-J.,Brown University | Chen W.-J.,Fuzhou University | Chen W.-J.,State Key Laboratory of Structural Chemistry | Huang X.,Fuzhou University | And 2 more authors.
RSC Advances | Year: 2012

The structure and chemical bonding in the Re 3O 3 - cluster are investigated using photoelectron spectroscopy and density-functional theory calculations. Vibrationally-resolved photoelectron spectra were obtained, yielding an accurate electron affinity (2.54 ± 0.02 eV) and a ground-state ReO stretching frequency (960 ± 30 cm -1) for the Re 3O 3 neutral cluster. It is shown that the Re 3O 3 - cluster possesses a C 2v ( 1A 1) ground-state structure consisting of a Re 3 triangle with one bridging and two terminal oxygens. Molecular orbital analysis reveals that the Re 3 core in Re 3O 3 - possesses conflicting d-orbital aromaticity (π-antiaromatic and σ-aromatic), consistent with its C 2v symmetry. Well-resolved photodetachment transitions from the Re 5d z 2 δ orbitals allow the bond strength and resonance energy of a delocalized δ-bond to be estimated. © 2012 The Royal Society of Chemistry. Source


Chen W.-J.,Fuzhou University | Chen W.-J.,State Key Laboratory of Structural Chemistry | Zhai H.-J.,Brown University | Huang X.,Fuzhou University | And 2 more authors.
Chemical Physics Letters | Year: 2011

We report a photoelectron spectroscopy and density-functional study on mono-rhenium oxide clusters: ReOn- and ReOn (n = 3, 4). Electron affinities of ReO3 and ReO4 are measured to be 3.53 ± 0.05 and 5.58 ± 0.03 eV. ReO3- is shown to possess a planar D3h (1A1′) ground state and ReO 3 adopts a nonplanar C3v (2A 1) structure. ReO4- has Td (1A1) structure, whereas ReO4 has Cs (2A′) symmetry due to Jahn-Teller effects and contains a Re-O radical unit. Localized Re 5d electrons in ReO3- and ReO3 give rise to Re 5+ and Re6+ centers, making them simple models for O 2 activation. © 2011 Elsevier B.V. All rights reserved. Source


Chen X.,CAS Fujian Institute of Research on the Structure of Matter | Chen X.,State Key Laboratory of Structural Chemistry | Luo W.,CAS Fujian Institute of Research on the Structure of Matter | Luo W.,State Key Laboratory of Structural Chemistry
Journal of Nanoscience and Nanotechnology | Year: 2010

Trivalent rare-earth (RE 3+) ion-doped TiO 2 nanophosphors belong to one kind of novel optical materials and have attracted increasing attention. The luminescence properties of different RE 3+ions in various TiO 2 nanomaterials have been reviewed. Much attention is paid to our recent progresses on the luminescence properties of RE 3+ (RE = Eu, Er, Sm, Nd) ions in anatase TiO 2 nanoparticles prepared by a sol-gel-solvothermal method. Using Eu 3+ as a sensitive optical probe, three significantly different luminescence centers of Eu 3+ in TiO 2 nanoparticles were detected by means of site-selective spectroscopy at 10 K. Based on the crystal-field (CF) splitting of Eu 3+ at each site, C 2v and D 2 symmetries were proposed for Eu 3+ incorporated at two lattice sites. A structural model for the formation of multiple sites was proposed based on the optical behaviors of Eu 3+ at different sites. Similar multi-site luminescence was observed in Sm 3+- or Nd 3+-doped TiO 2 nanoparticles. In Eu 3+-doped TiO 2 nanoparticles, only weak energy transfer from the TiO 2 host to the Eu 3+ ions was observed at 10 K due to the mismatch of energy between the TiO 2 band-gap and the Eu 3+ excited states. On the contrary, efficient host-sensitized luminescences were realized in Sm 3+- or Nd 3+-doped anatase TiO 2 nanoparticles due to the match of energy between TiO 2 band-gap and the Sm 3+ and Nd 3+ excited states. The excitation spectra of both Sm 3+- and Nd 3+-doped samples exhibit a dominant broad peak centered at ∼340 nm, which is associated with the band-gap of TiO 2, indicating that sensitized emission is much more efficient than direct excitation of the Sm 3+ and Nd 3+ ions. Single lattice site emission of Er 3+ in TiO 2 nanocrystals can be achieved by modifying the experimental conditions. Upon excitation by a Ti: sapphire laser at 978 nm, intense green upconverted luminescence was observed. The characteristic emission of Er 3+ ions was obtained both in the ultraviolet-visible (UV-vis) and near-infrared regions through the high-resolution experiments at 10 K. The CF experienced by Er 3+ in TiO 2 nanocrystal was systematically studied by means of the energy level fitting. Copyright © 2010 American Scientific Publishers All rights reserved. Source

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